DIRECTIONAL CONTROL OF DRILLING BOOM

A drilling boom 10 is pivoted about a first axis 12 or 14 on a base and is pivoted about that axis by a first hydraulic cylinder 15 or 17. It carries a feeder beam carrier 21 at its forward end. The carrier 21 is pivoted at the forward end of the boom 10 about a second axis 22 or 24 which is paralle...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	RAYMOND HEDGES, BRIAN HARRY JAMES, BRUCE ALLEN GEORGE EDWARD FOSTER
Format:	Patent
Sprache:	eng
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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